java.lang.NullPointerException: This exception has no message.

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This exception has no message.
java.lang.NullPointerException:
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at undefined.Forum_bd2.init(Forum_bd2.java:16)
at javax.servlet.GenericServlet.init(GenericServlet.java:266)
at com.sun.web.core.ServletWrapper.loadServlet(ServletWrapper.java:101)
at com.sun.web.core.ServletWrapper.handleRequest(ServletWrapper.java:119)
at com.sun.web.core.InvokerServlet.service(InvokerServlet.java:168)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:840)
at com.sun.web.core.ServletWrapper.handleRequest(ServletWrapper.java:155)

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